Dishwashing machine



Feb. 2, 1932. .1. E. LEDERMAN v 1,843,727

I D'IsHwAsH-NG MACHINE Filed March 18, 1929 ing,

Patented Feb. 2,4 1932 UNIT-ED STATES PATENT., OFI-rca JOHN E. ILEDERMAN, OE MILWAUKEE, WISCONSIN, ASSIGNOB TO HYDRO ELECTRIC MANUFAUPURING- COMPANY, F MILWAUKEE, WISCONSIN', A COBEOBATION OF wisconsin DIsnwAsnINa MACHINE' Application led liaroh 18, 1929. Serial No. 847,933.

The invention relates to dishwashing machines.

i l-Ieretofore in dishwashing machines in which the washing liquid is sprayed from a 'rotatingnozzle, either directly on the dishes or indirectly through deiiection from the casit has been customary to mount the spray nozzle on a supply conduit provided wlth one or more plain holes that conduct the washin particularly liquid to the arm or arms of the sprayer. t has been found in such constructions that the resistance to the passage of water to the arms through these holes is so great that considerable water escapes through the. joint be.

tween the spray arm and its pivot, with a resulting loss in eiliciency. This diiliculty has been overcome in the present inventlony by lproviding large passages between the `conduit and the arms and forminthe top of such passages as a deleotor, where y the washing liquid is turned from an axial to a radial ilow throu h the arms, with a minimum loss, and considerable saving in water necessary to wash the dishes is effected over prior constructions. p

The invention further consists in the several features hereinafter set forth and more defined by claims at the conclun the drawings Fig. 1 is a vertical sectional view through a dishwashing machine-embodying the invention;

Fig. 2 is a detail vertical sectional view through a spray arm and its mounting embodying the invention;

Fig. 3 is a plan view of a device embody- P ing the invention, parts being broken away and parts being shownin section.

The particular dishwashing machine in connection with which the present invention is illustrated has been shown and described in my prior application, Serial No. 291,197, filed July 9, 1928, and for the purpose of the present invention it is pointed out that the machine includes a casing having side walls 4, a rear wall5, a pivoted cover 6 forming a front wall, a dish basket 7 removably mount.

ed on brackets 8 secured to the side wall, a bottom 9 provided with a drain opening 10 and a motor-driven pump 11 mounted below the bottom in a com artment 12 on a suitable support 13, the washing liquid either being inby large side openings 18 anda top 19 having inclined sides 20, said top being connected to the main bodypf the fitting by relatively narrow strips 21. The fitting also has a cylindrical portion 22 terminating atv an annular shoulder 23 and a flat surface 24 from' which a threaded exterior 25 projects.

The spray member includes a pivot fitting 26 having pipe arms 27 in threaded'engagement therewith and provided with discharge openings 28 and 29,'one or both of which may be incllned so as to produce rotation of the arm under the action of the washing liquid, as is common in sprinklers.

The fitting 26 has a bore 30 loosely fitting the cylindrical portion 22 and when at rest the upper end 31 of the fitting, which is of reduced diameter compared to the bore 30, may engage the surface 24. This end is threaded to receive a cap 32 and has a cen-l trally disposed bore 33, through which the threaded extension loosely projects, with a conically formed seat 34 at its upper end.

A nut 35 of bronze or other suitable bearing material is threaded on the extension 25 and has a conically formed bearing portion 36 with which the seat 34 engages and it is, in accordance with well known sprinkler ractice, the only part in end-thrust engagementv with the arm while the pump is running, since the pressure of the liquid acting upwardly against the upper end of the tting 26 and the cap lifts the arm from the surface 24 and serves to hold the spray arm against the bearing 36. The cap 32 extends over the extension 25 and the nut and closes ofi' the upper end of the fitting 26.

With this construction the washin l liquid from the pump isvdelivered throng the bore 17, openings 18 to the arms 27, and thence through openings 28 and 29 into the casing where it strikes the dishes placed in the basket 7 either directly or indirectly through 2- maare? deflection from the casing. 1t will be noted that the lower sides 37 ofthe openings 18 incline outwardly and downwardly from the ribs or strips 21.

As the washing liquid passes from the bore 17 through the openings 18 its iow is changed with a minimum of disturbance as the large openings and the inclined surfaces or sides 20 assist in chan ing its flow from an laxial to a radial direction and tests show that because of these features far more water is available at the spray tips than in prior constructions where radially disposed slots or holes were used, it being noted that the `whole upper end of the bore 17 opens into the pivot fitting 26 except for the narrow strips 21.v rllhe result is a saving in washing liquid and in consequence a saving of power to operate the machine and a more ,effective distribution of the liquid.

lf desire it to be understood that this invention is not limited to any particular form or arrangement of parts except insofar as such limitations are includedin the claims.

What l claim as my invention is: 1. ln a dishwashing machine, the combination of a spraying device including a rotatable spray arm, a pivot fittin forming an inlet conduit for said arm provi ed with a top defiector portion having sides inclining from the center outwardly and upwardl and relatively 'narrow parts connecting sai portion with the mainbody of said fittmg whereby the washing liquid'is changed in its flow from an axial to a radial direction without turbulence and resulting energy losses, a bearing for said arm mounted on said pivot fitting above said deiector portion, and a cap on said 'arm covering'said bearing.

2. lln a'dishwashing machine,` the combination of a spraying device including a rotatable spray armya' pivotfitting havmg an inlet -conduit portion provided with a top v.

deiector and large side openings at' its upper end and a threaded'A extension, a conically curved bearing member mounted on'said threaded extension, said spray arm having a tubular portion havinga seat engaging said bearing member, and a cap fitting over said tulni'lar portion, said bearing member and said extension, said bearing member taking the full end thrust of the arm when the device is in operation.

lln testimony whereof, I aix mv signature.

JHN E. LEDERMAN. 

